Your company has an Active Directory Domain Services (AD DS) domain. Al l client computers run Windows 7. You have a Remote Desktop Session Host (RD Session Host) server. You need to ensure that each user is authenticated to the RD Session Host server before a session is created. What should you do?（）

• A、Set the security layer op tion to RDP Security Layer.
• B、Set the encryption level option to FIPS Compliant.
• C、Set the log on option to  Always prompt for password.
• D、Set the security option to Allow connections only from computers running Remote Desktop with Network Level Authenticat ion.